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박용현,Park, Yong-Hyeon 한국대학교육협의회 2007 大學敎育 Vol.149 No.-
로스쿨 법안 통과 후 국내의 많은 대학들이 사활을 걸고 로스쿨 유치를 위해 사력을 다하고 있다. 이에 로스쿨 유치를 희망하는 대학들 간의 공통된 의견과 함께 대비되는 의견은 무엇인지, 인적·물적 인프라 구축정도 및 교육과정과 교육방법, 대학별 특성화전략 등에 대해 알아봄으로써 우리 대학들이 로스쿨을 어떻게 준비해왔고, 추진해왔는지 살펴보고자 한다.
가방 하중의 크기와 방식에 따른 척추 정적 자세의 변화
박용현,김영관,김윤혁,Park, Yong-Hyun,Kim, Young-Kwan,Kim, Yoon-Hyuk 대한의용생체공학회 2011 의공학회지 Vol.32 No.3
The aim of this study was to investigate the alteration of lumbar spine and trunk postures on different load-carrying types and amounts under static loading. Two load-carrying types(unilateral carrying: UC vs. bilateral carrying: BC) and four different loads(0, 5, 10, and 15 kg) were randomly tested in this study. Carrying a heavy bag would affect human body posture, specifically lumbar spine curvature, which is considered as one of sources of back problems. Previous studies have not paid attention to the approach of the multisegment model of the lumbar spine and trunk. This study separated two compartments of trunk segment(the lumbar and thorax) in the analysis. The multisegment model of the lumbar spine in addition to Helen-Hayes marker set was used. Eight motion analysis cameras and a force plate were utilized. Ten male subjects(mean mass, $70.6{\pm}3.97$ kg; mean height, $178{\pm}4.18$ m) having no musculoskeletal disease participated in this study. We analyzed trunk angles in three anatomical planes and the spinal curvature in sagittal and frontal planes. Increased loading in both UC and BC significantly resulted in increases in trunk forward lean but only UC induced increases in trunk lateral lean. In addition, increased loading in BC produced flatten lumbar curvature in sagittal plane. As far as coupling motion, subjects tended to use axial rotation of the lumbar spine in transverse plane in response to increased UC loading. Finally, it is concluded that the increased static loading in UC rather than in BC tends to causes combined alterations of the spinal postures(sagittal and transverse planes together), which would be vulnerable to improper mechanical stresses on the spine.
박용현(Yonghyun Park),전종표(Jongpyo Jun),손형일(Hyoung Il Son) 제어로봇시스템학회 2021 제어·로봇·시스템학회 논문지 Vol.27 No.3
In Korea, Chinese cabbage harvesting is insufficiently mechanized and automated, and this task is typically carried out using manual labor. Thus, research on Chinese cabbage harvesters is required. However, the terrain in cabbage fields is generally rough and comprises many obstacles. Consequently, problems such as overcutting, missed cutting, and side cutting occur while cutting cabbages using a cabbage harvester. Therefore, it is necessary to study the cutting mechanism of the harvester to perform accurate cutting, considering the terrain in the fields. To this end, a three-axis attitude control mechanism was designed in this study; this mechanism controls the cutting device of the Korean cabbage harvester with three cylinders. In addition, an accelerometer, a gyro sensor, and a rotary encoder were designed for sensor fused. The cylinders were controlled such that the measured roll (Φ) and pitch (θ) were level with the ground. In addition, the angle of the guide in the cutting device (θe), driven by grounding to the ground, was calibrated using the height data. The cylinder in the sliding (x) axis was controlled to maintain the target height. Further, a proportional-integral-derivative controller was integrated to reduce overshoot and improve stability. To assess the performance of the algorithm, a 2:1 scaled-down model of the cutting device of the Korean cabbage harvester was produced, and the attitude control mechanism was installed on its driving platform and tested. Attitude measurement was performed using a motion capture device (OptiTrack). For quantitative evaluation, data with and without the attitude control system were compared by estimating their root mean square error (RMSE). The RMSE values for the level and height were 0.89° and 2.23 cm, respectively, for attitude control with the posture control system; however, those for attitude control without the posture control system were 2.15° and 4.05 cm, respectively. In addition, improvements of 58% in the level control and 45% in the height control were observed. In further investigations, better results can be obtained using the harvester if the changes in the angle and height are higher than those obtained in this experimental environment.
박용현(Yonghyun Park),황재원(Jaewon Hwang),고영중(Youngjoong Ko) 한국정보과학회 2010 정보과학회논문지 : 소프트웨어 및 응용 Vol.37 No.12
최근 모바일 기기의 발전으로 인하여, PC뿐만 아니라 모바일 기기에서의 정보검색의 요구가 증가하고 있다. 모바일 기기에서 명사를 추출하기 위하여 기존의 언어분석도구를 사용하게 되면, 상대적으로 적은 메모리를 가지고 있는 모바일 기기에는 부담이 되게 된다. 따라서, 모바일 기기에 적합한 언어분석도구의 필요성이 증가하고 있다. 본 논문에서는 대량의 말뭉치로부터 추출한 명사 출현 특성과 후절어를 이용하여 명사를 추출하는 방법을 제안한다. 제안된 명사 추출기는 형태소 분석기를 사용한 기존 명사 추출기의 명사 사전의 약 4% 용량인 146KB의 명사 사전만을 사용함에도 불구하고, 최종적으로 F1-measure 0.86라는 좋은 성능을 얻었다. 또한, 명사 사전에 대한 의존도가 낮으므로, 미등록 명사 추출에 대한 성능이 높을 것으로 예상된다. Since the performance of mobile devices is recently improved, the requirement of information retrieval is increased in the mobile devices as well as PCs. If a mobile device with small memory uses a tradition language analysis tool to extract nouns from korean texts, it will impose a burden of analysing language. As a result, the need for the language analysis tools adequate to the mobile devices is increasing. Therefore, this paper proposes a new method for noun extraction using post-noun morpheme sequences and noun patterns from a large corpus. The proposed noun extractor has only the dictionary capacity of 146KB and its performance shows 0.86 F1-measure; the capacity of noun dictionary corresponds to only the 4% capacity of the existing noun extractor with a POS tagger. In addition, it easily extract nouns for unknown word because its dependence for noun dictionaries is low.
10년간 경험한 담석환자 1719예의 역학적 및 임상적 특징 분석
박용현(Yong Hyun Park),김선회(Sun Whe Kim),최재운(Jae Woon Choi) 대한소화기학회 1993 대한소화기학회지 Vol.25 No.1
N/A To clarify the epidemiological and clinical characteristics of gallstone disease in Korea and to evaluate the chronological changes of gallstone disease, the authors reviewed the medical records of 888 surgically proven gallstone patients at the SNUH from 1986 to 1990 (late 5 year.) and comparied these results with previous report (analysis of 831 gallstone patients 1981-1986; early 5 years). And we integrated this data set with that from previous report that reviewed 2,252 cases of biliary calculi in Korea from 1961 to 1980. The results are summarized as below. The proportion of gallbladder stone was approximatly 80%. It did not differ between early 5 year., and late 5 years. The proportion of CRD stone has decreased. But that of IHD stone was slightly increased in late 5-years. Female preponderance was not so striking as in westem people in both periods. The rate associated with infection decreased in late 5 years. IHD stone group was younger than that of other stones and had high residual stone rate. Chronological analysis showed that th. pattern of gallstone disease was changing to that of westernized country. These findings in changing pattern might be related to the increased standard of living in Korea, especially westernized diet.